• With left-back out for two months, deal was brought forward• 'We had to make a quick decision' says Arsène WengerArsène Wenger has revealed that Kieran Gibbs's injury setback made it imperative for Arsenal to sign the Spain full-back Nacho Monreal from Malaga on transfer window deadline day.Wenger pushed through the deal, believed to be for £8.5m, after Gibbs hobbled off with a thigh problem in Wednesday night's 2-2 Premier League draw against Liverpool at the Emirates Stadium.With the injury expected to rule the England left-back out of action for the best part of two months, Wenger was glad to be able to sign a player he had been trackin...